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If I wasn;t clear enough about this example: An ontology aware system doesn't care at all about these two forms, they are identical as far as it is concerned -- even if we don't explicitly label the <object> as a <Person> the system knows that we are dealing with a <Person> because only people have <SSNs> This is where ontologies allow you to be *more flexible* in how data is exchanged -- as long as the system has the knowledge to figure it out it will.. > > Didier I want to discuss the differences between my example and yours > a bit more: > > I started with: > > <Person xmlns="http://example.org/ex"> > <SSN rdf:resource="uuid:ssn:1112223344"/> > <hasIncomeOf>1000000</hasIncomeOf> > <ownsHouse> > <House> > <hasAddress>1234 West Ridge Road</hasAddress> > </House> > </ownsHouse> > </Person> > > and Didier then asked about (simplified): > > > <object xmlns="http://example.org/ex"> > <SSN rdf:resource="uuid:ssn:1112223344"/> > <hasIncomeOf>1000000</hasIncomeOf> > <ownsHouse> > <House> > <hasAddress>1234 West Ridge Road</hasAddress> > </House> > </ownsHouse> > </object> > > > Jonathan
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